Impeller shoe for impact crusher

An elongated impeller shoe for mounting to a bracket on a horizontal turntable of a vertical axis centrifugal rock crushing machine to accelerate aggregate radially outward from a central distribution cone to impact against stationary anvils to thereby crush the aggregate, said impeller shoe comprising:

• an elongated body of wear resistant alloy material extending longitudinally from an inner end to an outer end;
• said body having a generally trapeziform shape with a back bearing surface on one side extending longitudinally between the inner end and the outer end and adapted to bear against a said turntable bracket, a working front face extending longitudinally between upper and lower longitudinal channel lips from the inner end to the outer end, said front face having a plurality of adjacent exterior surfaces that each extend from the upper channel lip to the lower channel lip, each surface being adapted to lie substantially in a plane that is perpendicular to the plane of said turntable when said impeller shoe is mounted properly thereon and each surface forming a different acute angle with respect to said back bearing surface, the angles said exterior surfaces form with respect to said back bearing surface decreasing from the inner end to the outer end, and said exterior surfaces being adapted for receiving and directing aggregate therealong, an outer end surface extending transversely between the outer end of one working front face surface to the back bearing surface, and an inner end surface extending transversely between the inner end of another front face surface and the back bearing surface;
• whereby said working front face in use produces a progressive wear pattern along its length that is substantially uniform in depth.